Electronic device

Abstract

An electronic device including a circuit board, a substrate, and at least one button unit is provided. The circuit board has a first surface and at least one switch thereon. The substrate has a second surface, a third surface opposite to the second surface, and at least one protrusion on the second surface. The third surface of the substrate and the first surface of the circuit board are face to face, and the protrusion is above the switch. The button unit is fixed on the second surface of the substrate. The button unit has an opening, and the protrusion passes through the opening.

1 . An electronic device, comprising: 
 a circuit board, having a first surface and at least one switch thereon;    a first substrate, having a second surface, a third surface opposite to the second surface, and at least one protrusion on the second surface, wherein the third surface of the first substrate and the first surface of the circuit board are face to face, and the protrusion is above the switch; and    at least one button unit fixed on the second surface of the first substrate, the button unit having an opening, and the protrusion passing through the opening.    
   
   
       2 . The electronic device as claimed in  claim 1 , wherein the protrusion and the first substrate are integrally formed.  
   
   
       3 . The electronic device as claimed in  claim 1 , wherein the diameter of the opening is greater than the diameter of the protrusion.  
   
   
       4 . The electronic device as claimed in  claim 1 , wherein the shape of the protrusion is a cylinder.  
   
   
       5 . The electronic device as claimed in  claim 1 , wherein the button unit is affixed to the first substrate.  
   
   
       6 . The electronic device as claimed in  claim 1 , further comprising a second substrate disposed between the first substrate and the circuit board.  
   
   
       7 . The electronic device as claimed in  claim 6 , wherein the material of the second substrate is rubber or plastic.  
   
   
       8 . The electronic device as claimed in  claim 1 , wherein a first top surface of the protrusion and the first surface are separated with a first distance, and a second top surface of the button unit and the first surface are separated with a second distance, and the first distance is greater than the second distance.  
   
   
       9 . The electronic device as claimed in  claim 1 , wherein the material of the first substrate is rubber or plastic.  
   
   
       10 . The electronic device as claimed in  claim 1 , wherein the material of the button unit is metal, rubber, or plastic.